Dental root-impression and swaging instrument.



PATENTED FEB. 21, 1905.

A. W. STARBUGK. DENTAL' ROOT IMPRESSION AND SWAGING INSTRUMENT.

APPLIGATION FILED MAY 19, 1904.

NTTED STATES Patented February 21, 1905."V

PATENT rricn.

ADELBERT W. STARBUOK, OF IOWA OITY, IOWA.

SPECIFICATION forming part of LettersPatent No. 783,327, dated February 21, 1905.

Application niet May 19, 1904. serial No. 208,752.

To all whom, 2113 may concern:

Be it known that LADELBERT W. STARBUCK, a citizen of the United States, residing at Iowa Oity, in the county of Johnson and State of Iowa, have invented new and useful Improvements in Dental Root-Impression and Swaging Instruments, of which the following is a specification.

My invention relates to new and useful dental root-impression and swaging instruments, and has for its object to provide an instrument whereby these operations may be carried out with great facility and improved result.

To the end stated, the invention consists in .an instrument constructed and arranged and adapted to operate in the manner hereinafter described and claimed, reference being made to the accompanying drawings, in which- Figure 1 isa perspective view of the instrument, the several parts assembled for use. Fig. 2 is a longitudinal section. Fig. 3 is a view of the several elements of the instrument separated. Fig. 4 is a view, partly in elevation and partly in section, showing a manner of using the instrument in obtaining an impression. Fig. 5 is a sectional View of the instrument, illustrating a manner of its usein swaging the matrix. Fig. 6 is asimilar view showing a manner of using the instrument in effecting final swaging of the matrix after the crown-post has been soldered thereto.

That which I regard as new will be set forth generically and specifically in the clauses of claim appended to the following description.

Referring to the drawings, in which the preferred and best known embodiment of my invention is illustrated, the reference-numeral 1 designates a ferrule in Vthe form of a sleeve, one edge of which is fashioned or shaped, as shown at Q, for example, to approximate the contour of a gum. This ferrule is arranged upon a piston 3 and has sliding engagement therewith. The piston is adapted to be operated within the ferrule by hand or any other suitable way to project or force the impression material against the root in the acty of taking an impression of the latter. A g'uidepin 4 is provided, by means of which the 'instrument may be properly centered and otherwise fitted to the root of a tooth in taking an impression thereof and in the trials preliminary to the taking of such impression. This guide-pin is arranged, in the example of my invention shown in the drawings, in a bore extending through the piston 3, and is adjustable in such bore and removable therefrom for the purpose hereinafter set forth. The guidepin may, if desired, be slightly bowed, as shown, so that it will retain any adjusted position in the bore by friction, or this object may be'attained in any other suitable way.

In the use of the instrument for taking impressions of roots of teeth prepared for crowning the ferrule is adjusted upon the piston with its festooned end 2 vprojt-icting beyond the end of the piston, and the guide-pin is adjusted in the bore of the piston with its pointed end projecting out of or beyond the ferrule, as shown in Fig. 4 of the drawings. The instrument is then litted to the tooth-root with the guide-pin entered in the root-canal, so that the instrument is properly centered with the festooned edge of the ferrule resting evenly upon all parts of the gum surrounding the tooth, and the trial or preliminary step of litting is'accomplished by the dentist in a way that will be wel! understood `by those skilled in the art, this trial or preliminary step being generally for thc purpose of ascertaining whether the particular ferrule selected for trial is the one best adapted for the given tooth-root. A suitable number of ferrules with ends fashioned or festooned and of different sizes to approximate as nearly as possible tooth-roots of various shapes and sizes will be provided in the complementof the dentists equipment. The trial step having been completed, the instrument will be removed and the space 6 within the ferrule, and which I term a cup,7 filled with the il'lipression material, such as modeling compound or dental lac (a specially-prepared lac `'for dental purposes, which may be softened by heat as desired in the use thereof and will harden thereafter to afford a properly-hardened impression against which a gold or platinum or other matrix may be swaged) or any impression compound commonly used in dentistry. The instrument will be then again fitted to the IOO tooth-root with the guide-pin entered into the root-canal and the festooned edge of the ferrule properly applied to the root and gum.

The operator will now force the piston forward in theferrule, projecting' or forcing the impression compound against the end of the root, securingan accurate impression of its tist in cutting out the gold or platinum or other matrix m and swaging it to conform accurately to the end of the tooth-root. The matrix m may be swaged in the following manner: Said matrix is adjusted upon the guide-pin 4 in front of the impression of the tooth-root previously obtained, for instance, in the manner before explained, and the instrument is then adjusted to the tooth-root with the matrix between the impression and said tooth-root and swaging by pressure is effected, the matrix conforming accurately to the contour of the tooth-root and the impression thereof. The swaging having been accomplished, the crown-post will be secured to the matrix in well-known manner. It is found that frequently in the operation of connecting the crown-post the matrix may be slightly changed in shape, and it is desirable to effect a final swaging of the matrix after the crown-post has been attached. This may be accomplished by removing the guide-pin Afrom the instru ment and inserting'the crownpost p, with one end in the root-canal and the other end in the bore, in the impression material, as illustrated in Fig. 6 of the drawings, and then by depressing the piston the iinal swaging will be accomplished.

Then the instrument is used in inlay-work, the process or method of procedure is similar to that hereinabove described with reference to the crownwork except that the guide-pin will be removed and not utilized. In this work the impression material will be injected or forced lnto the cavity to secure the desired impression.

By my invention I provide a root-impression swaging instrument whereby these operations may be accomplished with great facility and accuracy and with the least possible discomfiture to the soft tissues of the mouth of the patient.

Having thus described my invention, what I claim is*- 1. A root-impression and swaging instrument, comprising a ferrule, the edge of which is fashioned to approximate the shape or contour of a gum and adapted to receive impression material, of a piston movable in said ferrule and adapted to force the impression material contained therein into contact with the surface of which it is desired to take an impression.

2. A root-impression and swaging'instrument, comprising a ferrule, the end of which is fashioned to conform to the contour or shape of a gum, a piston arranged to be moved within said ferrule for the purpose described, and provided with a bore, and a guide-pin movably arranged in said bore and removable therefrom.

3. In a root-impression and swagingI instrument. a ferrule having its end fashioned to conform to the shape or contour of a gum, and a piston, said ferrule being adjustably and removably arranged upon said piston and said piston adapted to be moved in said ferrule, for the purpose described.

i. A root-impression and swaging instrument, comprising a ferrule having its end fashioned to approximate the shape or conformation of a gum, a piston provided with a bore, said ferrule being adjustably and removably arranged upon said piston, said piston adapted to be moved in said ferrule for the purpose set forth, and a guide-pin adjustably and removably arranged in the bore of the piston.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.-

ADELBERT W. STARBUCK.

I/Vitnesses:

G. GoLD'rI-IWAHE, E. R. VALKER. 

